Saggi What sort of cruise do you have in ind when you say never been on a cruiser.... niver will?
The cruise experience is immensly varied, and can vary from a motor cruiser on the Norfolk Broads, through a small boat (converted fishing boat) with perhaps 10-15 passengers, touring the Scottish islands, to river cruisers and every other permutatation and combination of ships, to humungous great ships, which house 10,000 passengers.
Some probably are floating hotels, the majority aren't.
Personally, a holiday sitting by a lovely pool, no matter how good or bad the hotel, holds no appeal.